ABSTRACT
A spatial collection organizes its elements by location in a multidimensional space. Example physical data sets include landmarks on a 2-dimensional street map, and star and planet coordinates in space. Data sets of higher dimension might include meteorological data with dimensions in space, time, barometric pressure, temperature, wind velocity, etc. Since each object can be treated as a point in a multidimensional space, we often refer to each object as a point.
